This portable frequency counter is designed for counting continuous wave signal comes from Two-way Radio. There are easy ranges for you to choose. The ranges cover most of the frequency of the two way radios you want to measure. Its four-button control is easy to use and its small size allows you to carry it anywhere you like.Work by TCXO(Temperature Compensate X'tal (crystal) Oscillator) ,In the range of -45 ℃ ~ 65 ℃ can reach ± 2 ~ ± 4ppm accuracyThis include very interesting frequency areas such as 2m HAM radio, all VHF and UHFDMR Radio signal e frequency counter.Easy Battery levelFrequency range: 27Mhz-3000MhzCTCSS/DCS DecoderLCD Dim level settingFrequency digital 0.000 or 0.0000Work by TCXO(Temperature Compensate X'tal (crystal) Oscillator) 2～2.5ppmFrequency Rresponse time: 0.2-0.5sec.( CTCSS/CDCSS >0.5-1sec) Color Display 240x320Build-in Li-ion batteryNet Weight: 113g 4 buttons controlAuto power off 1-9minutes Charging battery LED indicator